# Energy calibration of the NEXT-White detector with 1% resolution near Q$_{\beta\beta}$ of $^{136}$Xe

## TL;DR

This paper demonstrates that the NEXT-White detector achieves a 1% FWHM energy resolution at 2.6 MeV, marking the best resolution among xenon detectors for neutrinoless double-beta decay searches.

## Contribution

First demonstration of 1% energy resolution at 2.6 MeV using the NEXT-White detector, advancing xenon detector technology for rare event searches.

## Key findings

- Achieved 1% FWHM energy resolution at 2.6 MeV.
- Established the detector's suitability for neutrinoless double-beta decay searches.
- Set a new benchmark for xenon detector energy resolution.

## Abstract

Excellent energy resolution is one of the primary advantages of electroluminescent high pressure xenon TPCs, and searches for rare physics events such as neutrinoless double-beta decay ($\beta\beta0\nu$) require precise energy measurements. Using the NEXT-White detector, developed by the NEXT (Neutrino Experiment with a Xenon TPC) collaboration, we show for the first time that an energy resolution of 1% FWHM can be achieved at 2.6 MeV, establishing the present technology as the one with the best energy resolution of all xenon detectors for $\beta\beta0\nu$ searches.